MP7731
5W - 30W Class D Mono
Bridged Audio Amplifier
MP7731 Rev. 1.8 www.MonolithicPower.com 1
9/25/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The MP7731 is a mono, 5W - 30W Class D Audio
Amplifier. It is one of MPS’ second generation of
fully integrated audio amplifiers which dramatically
reduces solution size by integrating the following:
Start Up / Shut Down Pop Elimination
Short Circuit Protection Circuits
180m Power MOSFETs
Mute / Standby Mode
The MP7731 utilizes a full bridge output structure
capable of delivering 5W - 30W into 4Ω
speakers. As in all other MPS Class D Audio
Amplifiers, this device exhibits the high fidelity
of a Class AB amplifier with an efficiency of
90%. The circuit is based on the MPS’ proprietary
variable frequency topology Analog Adaptive
Modulation (AAM™, Patent No. 6,420,930; other
patents pending) that delivers excellent PSRR,
fast response time and operates on a single
power supply.
EVALUATION BOARD REFERENCE
Board Number Dimensions
EV0045 4.8cm x 3.0cm x 1.5cm
FEATURES
30W into 4 with V
DD
= 16.5V
90% Efficiency at 5W
Amplifies Full Audio Range with Low THD+N
Typical = 0.1%
9.5V to 18V Supply Voltage Operation
Full Bridge Output Drive
4 Integrated 180m Switches
Turn On / Turn Off Click and Pop Suppression
Integrated Short Circuit Protection
Integrated Thermal shutdown
Mute / Standby Mode
APPLICATIONS
• Flat Panel LCD and PDP Displays
• Notebook and Multimedia Computers
• Televisions
• Home Stereos
• DVD and VCD Players
• Game Devices and Systems
• Monitors
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks
of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
MP7731
NC
PIN1
NIN1
AGND1
NC
EN1
NIN2
PIN2
AGND2
EN2
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
PGND1
SW1
VDD1
BS1
NC
PGND2
SW2
VDD2
BS2
NC
AUDIO IN+
+
V
CC
V
CC
-
+
V
CC
V
CC
V
CC
EN
AUDIO IN-
50
20
10
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
THD+N (%)
100M
10 50
1
OUTPUT POWER (W)
THD+N vs Output Power
f=1kHz